powders and primers

You might try the H4350 powder as well sir. I have had great luck with Win LR primers, and the Wolf LR primers. Brass wise, You can go with Lapua and it should be pretty close to Just Load it UP, or you can go with something like Winchester brass and you will need to sort by internal volume, and make sure to check the necks ect... a good bit of brass prep in-other-words As for the 140gr bullets, believe it or not I have had fantastic luck with Sierra 140gr GKs out to about 800 yards! Bergers are real nice too however, but they can be a little bit finicky on seating depth.

They both give good advice, don't worry about primer seating depth it doesn't effect es noticably if they are flush in a uniform pocket as mentioned. Yes H4350 works good as well, but most of my reference comes from loading for bench guns, in that case the Imr usually is more consistent, but not always. Also mentioned was brass, weigh your brass try to get a batch sorted where all is within 2 grains of each other. A slight polish on the inside of the case neck also aides in more consistent releases, you can use 4-0 steel wool or 400 grit sand paper. All these things together will get your ES in the single digits.